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Continue to ChatASCO SCDUE353A811 - G3/4, Orifice Size 20mm, Threaded, ATEX Dust ll3D, Series 353 - ASCO Dust Collector Power Pulse Valves https://www.valves-direct.com/product/asco-scdue353a811-g3-4-orifice-size-20mm-threaded-atex-dust-ll3d-series-353-asco-dust-collector-power-pulse-valves/